We tow with at 3500 D/A and haven't seen any need for an exhaust brake with the Allison tow mode. There's lots of opinions on the matter. If you're not aware, you can read many of them on the diesel page
http://www.thedieselpageforums.com/tdpforum/index.php
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Robert Raab / Bruce Waterfield
2010 Ford F-450 Harley Davidson Edition
2007 Doubltree Elite Suite 36RS3 #3756
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